Glass-drawing apparatus.



J. W. GRUIKSHANK. GLASS DRAWING APPARATUS. APPLIOATION FILED MAR. 20, 1908.

914,117. Patented Mar. 2, 1909.

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, JAMES WiCRUIKSHANK, OF OAKMON'lfPENNSYLVANIA.

GLASS-DRAWING APPARATUS.

Application filed March 20, 1908. Serial No. 422,300. 1

' first to insure a strong upper-end .for the lass blank at and below its union with the ait, after which the movement gradually increases.

The primary object of this invention is to rovide im roved mechanism for automatically regu ating the s eed, the necessary slower movement being ad at the beginning of the operation, -with controlled or adjustable means for increasing the speed as conditions may require. The operation being automatic, the close attention of an attendant is not required, and hence the element of loss due to negligence is practically eliminated. Furthermore, the improved appa ratus is of simple and inex: ensive construc tion, and is operated at re atively low cost.

An embodiment of thelinvention is illus trated in the accompanying drawings, Figure 1 being an elevation of the same, broken and partly in section. Fig. 2 is a section of the speed regulating device, enlarged to approximately full size.

Referring to the drawings, 2 designates the iydraulio rod 10. A cross-head 11, sliding between rods 7, holds the bait centrally over pot or other zontainer 12 from which the molten glass is drawn.

Paralleling cylinder 2 is tube or cylinder 13 of the controlling mechanism, with'a valve connection 14 between the lower ends of the two cylinders, while higher up is a similar connection 15, and above this another similar connection 16. Water under pressure is admitted to the lower end of cylinder 13 through the valved connection 17, and the bottom of each cylinder is connected at-18 to \Vorking Specification of Letters Patent.

Patented March 2, 1909.

end oftubular piston rod 21, with the upper end of the latter secured'to one of arms 8. Piston rod 21. is necessarily of considerable length, and to-prevent buckling-a rod 22 is extended the whole length of cylinder 13, with its upper end connected to frame 6, the rod being embraced by piston 20 and the within cylinder 13 is piston 20 011 the lower I tubular rod 21, thus-bracing the latter as they raise and lower in unison with the main plunger '3.

lowere conveyed froma melting pot or tank in any suitable mariner), piston 20 is below connection 15, and hence water can pass to cylinder In operation, when the mechanism is in position, with-bait 9 entered in the glass contained in pot 12 (to which it may be I 2 only through connection 14, the valve of which may be so adjusted as to obtain the low rate of speed required at the beginning. Thus, ample time'i's afforded for the glass to form around and obtain a secure hold-on bait 9. As plunger 3 moves upward, air under pressure as required for blowing the blank is' admitted to the interior of the bait through tube 23, in manner well known in the art.

After the blank has been well started, the continued upward movemnet of piston 20 uncovers the second valved connection 15 which, like connection 14,- m'ay'be adjusted as required for admittin a lar er volume of water to cylinder 2 an there y increasing the speed of plunger 3. Any number of con-" 7 ,nections may thus be arranged between the two cylinders, and openedone after'the other by piston 20 for gradually increasingthe upward speed of the drawing mechamsm.

In the adaptation here shown, a third connection 16 is arranged well up toward the upper end, and above this the cylinders may be connected through by-pass 24, thus dis? T charging the water above piston 20 as. they latter moves upward, and especially after the piston passes the uppermost connection 16.

At the completion of the drawin operation,j exhaust valve 19 may be operate as required for discharginglthe Water from the cylinders and lowering t e mechanism. g It is characteristic of the inventlonthat the admission of, water to the mam cylinder in. increasing amounts as the plunger moves upward is controlled automatically by such upward movement. And with a valve"ior each of tliqcylinder connections, the increasing volume of water admitted through each may be regulated as conditions may require,

thereby insuring uniformity of operation and the best possible results.

I claim 1. in glass drawing apparatus, glass drawing means, a hydraulic cylinder and a plunger with a connection between the plunger and the drawing means, a plurality of water inlets for the cylinder, and means controlled by the movement of the plunger while actuating the drawing means for opening said inlets.

2.- In glass drawing apparatus, glass drawing means, a hydraulic cylinder and a plunger'with a connection between the plunger and the drawing means, a plurality of water inlets for the cylinder spaced apart in the direction of movement of the plunger, and means controlled by the movement of the plunger while operating the drawing means for opening said inlets successively.

3. In glass drawing ap aratus, glass drawing means, ahydraulie li. t including a cylinder and plunger with a connection between the-plunger and the drawing means, a series of water inlets for the cylinderone above the other, and means lcontrolled by the up.

ward movement ofl tlieplunger for opening said inlets successivelya. In glass 'drawine apparatus, glass drawing means, a hydraulic lii-trin cluding a cylinder and plunger with, svcojnneetion between the plunger and drawing means, a second cylinder having a water inle bat itsilower. end, a

plurality of water dpassages connecting the cylinders-arrange one above the other, and a piston within the second cylinder connected to and raised by the lift plungerfor establishing communication through said lishing 'communieation through thevalve connections as the-plunger moves upward.

ft including a cylin- 6. In glass drawing ap aratus,'glass drawingmeans, a hydraulic li t including a cylin- .der and plunger with a connection between the cylinder and drawing means, a second cylinder paralleling the lift cylinder with a water inlet'at the lower end of the second cyl inder, a plurality of water admitting connections between the cylinders-arranged one above the other, a piston within the second cylinder connected plunger whereby said connections are uncovered successively asthe plunger moves upward, and a guide extending through the y'a-tubular rod with the said second cylinder on Whic'h'the tubular rod moves.

In testimony whereof I affix my signature in presence of two witnesses.

Witnessesti 7 i. Jim. '3'. FITZGERALD,

J. M. Nnsnrr,

JAMES w. CRULIKSHANK. 

